Diamond



FIG. 1 is a top plan view of a diamond showing my new design;

FIG. 2 is a point side view;

FIG. 3 is flat side view;

FIG. 4 is top plan view of a diamond showing the second embodiment of my new design;

FIG. 5 is a point side view of FIG. 4; and,

FIG. 6 is a flat side view of FIG. 4. 

The ornamental design for a diamond, as shown and described. 